Mine is the standard size, I got it brand new off of a member here for a very good price. I don't notice a difference in the butt dyno, it adds maybe 4-5 hp, but when you blip the throttle it's much more responsive, and it smooths out the acceleration some. The standard size weighs I think 1.5lbs, and the stock one is 6.5lbs. Big difference. I think you'll like it. If you have any questions on the install let me know.
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